dt-bindings: nand: meson: add Amlogic NAND controller driver

Amlogic NAND Flash Controller (NFC) for GXBB/GXL/AXG family SoCs

This file documents the properties in addition to those available in

the MTD NAND bindings.

Required properties:

- compatible : contains one of:

  - "amlogic,meson-gxl-nfc"

  - "amlogic,meson-axg-nfc"

- clocks     :

	A list of phandle + clock-specifier pairs for the clocks listed

	in clock-names.

- clock-names: Should contain the following:

	"core" - NFC module gate clock

	"device" - device clock from eMMC sub clock controller

	"rx" - rx clock phase

	"tx" - tx clock phase

- amlogic,mmc-syscon	: Required for NAND clocks, it's shared with SD/eMMC

				controller port C

Optional children nodes:

Children nodes represent the available nand chips.

Other properties:

see Documentation/devicetree/bindings/mtd/nand.txt for generic bindings.

Example demonstrate on AXG SoC:

	sd_emmc_c_clkc: mmc@7000 {

		compatible = "amlogic,meson-axg-mmc-clkc", "syscon";

		reg = <0x0 0x7000 0x0 0x800>;

	};

	nand-controller@7800 {

		compatible = "amlogic,meson-axg-nfc";

		reg = <0x0 0x7800 0x0 0x100>;

		#address-cells = <1>;

		#size-cells = <0>;

		interrupts = <GIC_SPI 34 IRQ_TYPE_EDGE_RISING>;

		clocks = <&clkc CLKID_SD_EMMC_C>,

			<&sd_emmc_c_clkc CLKID_MMC_DIV>,

			<&sd_emmc_c_clkc CLKID_MMC_PHASE_RX>,

			<&sd_emmc_c_clkc CLKID_MMC_PHASE_TX>;

		clock-names = "core", "device", "rx", "tx";

		amlogic,mmc-syscon = <&sd_emmc_c_clkc>;

		pinctrl-names = "default";

		pinctrl-0 = <&nand_pins>;

		nand@0 {

			reg = <0>;

			#address-cells = <1>;

			#size-cells = <1>;

			nand-on-flash-bbt;

		};

	};